题解 | #字符串加解密#

#include <stdio.h>
#include <string.h>

int main() {
    char in[1000];
    char out[1000];
    int D = 'a'-'A';
    while(~scanf("%s",in))
    {
        scanf("%s",out);
        int in_len = strlen(in);
        int out_len = strlen(out);
        int i,j;
        for(i=0;i<in_len;i++)
        {
            if(in[i]>='a' && in[i]<'z')
            {   
                in[i] = in[i]-D+1;
            }else if(in[i] == 'z'){
                in[i] = 'A';
            }else if(in[i]>='A' && in[i]<'Z')
            {
                in[i] = in[i] +D+1;
            }else if(in[i] == 'Z')
            {
                in[i] ='a';
            }else if(in[i]>=0 &&in[i]<'9')
            {
                in[i]+=1;
            }else if(in[i] == '9')
            {
                in[i] = '0';
            }
        }

        for(i=0;i<out_len;i++)
        {
            if(out[i]>'a' && out[i]<='z')
            {   
                out[i] = out[i]-D-1;
            }else if(out[i] == 'a'){
                out[i] = 'Z';
            }else if(out[i]>'A' && out[i]<='Z')
            {
                out[i] = out[i] +D-1;
            }else if(out[i] == 'A')
            {
                out[i] ='z';
            }else if(out[i]>'0' &&out[i]<='9')
            {
                out[i]-=1;
            }else if(out[i] == '0')
            {
                out[i] = '9';
            }
        }

        printf("%s\n",in);
        printf("%s",out);
    }
}